BUG: make list copy py2.7 compatible
BUG: make list copy py2.7 compatible

guillochon/FriendlyFit,guillochon/MOSFiT,guillochon/MOSFiT,bmockler/MOSFiT,mnicholl/MOSFiT,guillochon/MOSFiT,mnicholl/MOSFiT,mnicholl/MOSFiT,villrv/MOSFiT,bmockler/MOSFiT,villrv/MOSFiT